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Shore A78 TDI 80 Polyurethane Prepolymer Sealing O-Rings Raw Material

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Shore A78 TDI 80 Polyurethane Prepolymer Sealing O-Rings Raw Material

Country/Region	china
City & Province	qingdao shandong
Categories	Chemical Reagents

Product Details

Shore A78 TDI 80 Polyurethane Prepolymer Sealing O-Rings Raw Material

1. Description

This is a TDI-80 based polyether polyurethane prepolymer.

2. Characteristics

Water resistance
Low temperature resistance
Mold resistance

3. Applications

Roller
Plate and bar
Sealing ring

4. Typical properties

Type	Appearance	Viscosity(mPa.s/85℃)	NCO%	Packing(kg/drum)
	Liquid	250-280	3.5-3.7	20/200

5. Operating Procedure

First, the prepolymer should be preheated in 80-85℃. Second, after vacumming, the prepolymer is to be mixed with melting MOCA evenly. Third, with degassing, casting into mould, and vulcanization,and then demould. Lastly, the finished product should be post vulcanized.

6. Reaction parameters

Item	MOCA (%)	Gel time(min)	Mixing temperature(℃)	Post vulcanization(h)
Specification	10-10.3	5-6	85/120	10

7. Finished products properties

Item	Hardness(Shore A)	Tensile strength(MPa)	Tear strength(KN/m)	Rebounding(%)
Physical properties	78-80	9-10	40-45	48

Cast polyurethane elastomers provide advantages such as elasticity, a long service life and excellent wear resistance. Our polyurethane hot cast elastomers based on toluene diisocyanate (TDI) can be formulated with a wide range of mechanical properties including different hardness levels thanks to ester- or ether-based prepolymers.